Question

I have just started experimenting on android. I am reading book Beginning Android 4 application development by Wrox pulication. There is a code for showing notifications. The problem is the code I have written(not copied) is very little modified. So, I am able to show notification on status/notification bar but on clicking the notification the notificaion class is not being invoked. Here is the code for android_mainfest first.

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="legacy_systems.notificationproject"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="7"
    android:targetSdkVersion="9" />
<uses-permission android:name="android.permission.VIBRATE"/>

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="legacy_systems.notificationproject.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity 
        android:name="Notification"
        android:label="Details of the Notification" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.DEFAULT" />                    
        </intent-filter>
    </activity>
</application>

</manifest>

Now, the code for MainActivity
package legacy_systems.notificationproject;

import android.os.Bundle;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.view.View;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {
int notificationID = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

public void onClick(View V)
{
    getNotification();
}

protected void getNotification()
{
    Intent i = new Intent(this, Notification.class);
    i.putExtra("notificationID", notificationID);
    PendingIntent pn = PendingIntent.getActivity(this, 0, i, 0);
    NotificationManager nm= (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
    Notification n = new Notification(R.drawable.ic_launcher,
                                      "Reminder! Meeting starts in 5 Minute",
                                      System.currentTimeMillis());
    CharSequence from = "System Alarm";
    CharSequence message = "Meeting with customer in next 2 minute";
    n.setLatestEventInfo(this, from, message, pn);
    n.vibrate = new long[]{ 100,250,50,500};
    nm.notify(notificationID, n);       
}

}

And, the code for Notification.java is
package legacy_systems.notificationproject;

import android.app.Activity;
import android.os.Bundle;
import android.app.NotificationManager;
import android.util.Log;

public class Notification extends Activity{
String tag;

public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    Log.d(tag,"In here");

    setContentView(R.layout.notification);

    NotificationManager nm = (NotificationManager)getSystemService(VIBRATOR_SERVICE);
    nm.cancel(getIntent().getExtras().getInt("notificationID"));
}
}

And activity_main.xml is,

<xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<Button
    android:id="@+id/btn"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    android:text="@string/getnot"
    android:onClick="onClick"
 />

</RelativeLayout>    

Answer 1

You would be well-advised to not name your own classes the same name as system-defined classes. You are attempting to open android.app.Notification as an activity, which will not work and should be resulting in warnings in LogCat.

Please rename your Notification activity to something else, such as Easdluaerdf, so as to make it unique, adjusting your manifest and PendingIntent to match, and you should have better luck.